CN112840588B - End-to-end data transmission method and equipment - Google Patents
End-to-end data transmission method and equipment Download PDFInfo
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- CN112840588B CN112840588B CN201980062147.4A CN201980062147A CN112840588B CN 112840588 B CN112840588 B CN 112840588B CN 201980062147 A CN201980062147 A CN 201980062147A CN 112840588 B CN112840588 B CN 112840588B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The embodiment of the disclosure provides an end-to-end data transmission method and equipment. The method comprises the following steps: the side-link control information (SCI) is encoded according to the side-link subchannel size, and the encoded SCI is modulated (S402), the modulated SCI is mapped onto a physical side-link control channel (PSCCH) (S404), and when a frequency domain side-link subchannel is used to transmit a physical side-link shared channel (PSSCH), the PSCCH is repeatedly transmitted in the same side-link subchannel used to carry the PSSCH corresponding to the PSCCH (S406).
Description
Cross Reference to Related Applications
The present disclosure claims priority from U.S. provisional patent application No. 62/754,174 filed on 1 month 11 of 2018, the entire disclosure of which is incorporated herein by reference.
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to an end-to-end (end-to-end) data transmission method and apparatus.
Background
In the legacy design of the Long Term Evolution (LTE) internet of vehicles (V2X) specification, side links have been specified for direct communication between User Equipment (UEs). The side uplink physical channels include: physical side uplink control channel (PSCCH) and physical side uplink shared channel (PSSCH). The PSSCH is used to carry data from the transmitting UE for side-link communication, and indicates the resources and other transmission parameters used by the receiving UE for PSSCH reception.
For next generation direct internet of vehicles (V2X) communication systems to be based on newly developed 5G (fifth generation) new radio (5G-NR) technology, the new system needs to support higher-level V2X usage scenarios and services that cannot be provided by the current LTE-V2X system. Thus, high reliability and low latency transmission become more important and critical to ensure timely delivery of V2X messages to the intended recipient.
The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides an end-to-end data transmission method and apparatus.
In a first aspect, the present disclosure provides an end-to-end data transmission method, which may include: the method includes encoding side-link control information (SCI) according to a side-link sub-channel size, modulating the encoded SCI, mapping the modulated SCI onto a physical side-link control channel (PSCCH), and repeating transmission of the PSCCH in the same side-link sub-channel used to carry a PSCCH corresponding to the PSCCH when a frequency domain side-link sub-channel is used to transmit a physical side-link shared channel PSCCH.
In embodiments of the present disclosure, the side-uplink subchannels in the frequency domain are contiguous.
In an embodiment of the present disclosure, the method may further include: information of a side downlink sub-channel is received.
In an embodiment of the present disclosure, the method may further include: receiving a side-uplink resource pool for side-uplink transmissions; and determining a side uplink sub-channel based on the resources of the PSSCH and the PSCCH in the side uplink resource pool.
In a second aspect, the present disclosure provides an end-to-end data transmission method, which may include: listening to the configured PSCCH, receiving its PSCCH in a side-link subchannel, and decoding the SCI from the received PSCCH.
In an embodiment of the present disclosure, decoding the SCI from the received PSCCH includes: each PSCCH is demodulated in units of side-link sub-channels and the SCI is decoded separately.
In an embodiment of the present disclosure, decoding the SCI from the received PSCCH includes: the received PSCCHs are incrementally combined across the side-link sub-channels and the combined SCI is decoded.
In a third aspect, the present disclosure provides a terminal, which may include: the device comprises a coding unit, a modulation unit, a mapping unit and a transmission unit; wherein the encoding unit is configured to encode the SCI according to a side-uplink subchannel size; the modulation unit is configured to modulate the encoded SCI; the mapping unit is configured to map the modulated SCI onto the PSCCH; the transmission unit is configured to repeatedly transmit a PSCCH in a same side-link subchannel used to carry a PSCCH corresponding to the PSCCH when the PSCCH is transmitted using a frequency domain side-link subchannel.
In an embodiment of the present disclosure, the side-uplink subchannels in the frequency domain are contiguous.
In an embodiment of the present disclosure, the terminal may further comprise a receiving unit, wherein the receiving unit is configured to receive the information of the side downlink sub-channel.
In one embodiment of the present disclosure, the terminal may further include: a determining unit and a receiving unit, wherein the receiving unit is configured to receive a side-uplink resource pool for side-uplink transmission; the determining unit is configured to determine the side-link sub-channels based on the resources of the PSSCH and the PSCCH in the side-link resource pool.
In a fourth aspect, the present disclosure provides a terminal that may include a receiving unit configured to listen to a configured PSCCH and receive its PSCCH in a side-uplink sub-channel, and a decoding unit configured to decode a SCI from the received PSCCH.
In an embodiment of the present disclosure, the decoding unit is further configured to demodulate each PSCCH in units of side-link subchannels and individually decode the SCI.
In an embodiment of the present disclosure, the decoding unit is further configured to incrementally combine the received PSCCHs across side-link sub-channels and decode the combined SCIs.
In a fifth aspect, the present disclosure provides a terminal device for performing the above first aspect or any possible implementation of the first aspect. In particular, the terminal device comprises functional modules for performing the method of the first aspect above or any possible implementation of the first aspect.
In a sixth aspect, the present disclosure provides a terminal device, including a processor and a memory; wherein the memory is configured to store instructions executable by the processor and the processor is configured to perform the method of the first aspect above or any possible implementation of the first aspect.
In a seventh aspect, the present disclosure provides a computer readable medium for storing a computer program comprising instructions for performing the above first aspect or any possible implementation of the first aspect.
In an eighth aspect, the present disclosure provides a computer program product comprising a non-transitory computer readable storage medium storing a computer program, wherein the computer program is executable to cause a computer to perform the method of the first aspect or any possible implementation of the first aspect.
In a ninth aspect, the present disclosure provides a terminal device for performing the method of the second aspect or any possible implementation of the second aspect. In particular, the terminal device comprises functional modules for performing the method of the above second aspect or any possible implementation of the second aspect.
In a tenth aspect, the present disclosure provides a terminal device comprising a processor and a memory. Wherein the memory is configured to store instructions executable by the processor and the processor is configured to perform the method of the second aspect above or any possible implementation of the second aspect.
In an eleventh aspect, the present disclosure provides a computer readable medium for storing a computer program comprising instructions for performing the above second aspect or any possible implementation of the second aspect.
In a twelfth aspect, the present disclosure provides a computer program product comprising a non-transitory computer readable storage medium storing a computer program, wherein the computer program is executable to cause a computer to perform the method of the above second aspect or any possible implementation of the second aspect.
The end-to-end data transmission method according to the embodiments of the present disclosure aims to solve the problem of transmission power mismatch between PSCCH transmission and PSSCH transmission described in the present disclosure, while allowing low-delay transmission of messages of large data TB size. Other benefits of using the above-described transmission structure include: the reliability of PSCCH reception is improved by combining the retransmitted control channel transmissions at the receiving end; no additional receiver complexity in decoding the control channel information; and allows the UE to flexibly implement control channel reception and decoding of the PSCCH, since combining the PSCCH is performed at the full discretion of the receiving terminal prior to decoding.
This section provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all of the features of the technology disclosed.
Drawings
In order to more clearly describe the technical solutions in the embodiments of the present disclosure, the drawings required for describing the embodiments of the present disclosure will be briefly introduced below. It is evident that the drawings in the following description illustrate only some embodiments of the disclosure and that other drawings may be derived from these drawings by a person of ordinary skill in the art without the exercise of inventive effort.
Fig. 1 schematically illustrates an end-to-end data transmission system architecture according to an embodiment of the present disclosure.
Fig. 2 schematically illustrates a structure for side-uplink control channel retransmission on multiple side-uplink sub-channels.
Fig. 3 schematically illustrates a flow chart of an end-to-end data transmission method according to an embodiment of the present disclosure.
Fig. 4 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure.
Fig. 5 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure.
Fig. 6 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure.
Fig. 7 schematically illustrates a terminal according to an embodiment of the present disclosure.
Fig. 8 schematically illustrates a terminal according to another embodiment of the present disclosure.
Fig. 9 schematically illustrates a terminal according to another embodiment of the present disclosure.
Fig. 10 schematically illustrates a terminal according to another embodiment of the present disclosure.
Fig. 11 schematically illustrates a terminal device according to an embodiment of the present disclosure.
Fig. 12 schematically illustrates a terminal device according to another embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown. However, the exemplary embodiments of the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; the present disclosure is not limited to the disclosed embodiments. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like reference numerals in the drawings denote like elements, and thus a description thereof will be omitted.
The described features, structures, or/and characteristics of the present disclosure may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are disclosed to provide a thorough understanding of embodiments of the present disclosure. One skilled in the relevant art will recognize, however, that the disclosure may be practiced without one or more of the specific details, or with other methods, components, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
In the present disclosure, terms such as "connected" and the like are to be construed broadly and may be connected directly or indirectly through intervening media, unless otherwise indicated. The specific meaning of the above terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.
Furthermore, in the description of the present disclosure, unless explicitly defined otherwise, the meaning of "a plurality" is at least two, e.g., two, three, etc. An "and/or" describing an association relationship of an associated object indicates that there may be three relationships, e.g., a and/or B, which may indicate that there are three cases: single a, single B and both a and B. The symbol "/" generally indicates that the context object is an "or" relationship. The terms "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include one or more features.
In some related art NR-V2X communication, HARQ (hybrid automatic repeat request) feedback from a receiving UE (Rx-UE) to a transmitting UE (Tx-UE) is proposed for indicating whether the same control channel and data Transport Block (TB) need to be retransmitted multiple times to achieve high reliability of delivering V2X messages. However, this scheme is only applicable to V2X communication of unicast type or multicast type. That is, for broadcast type V2X communications without any feedback from the recipient UE, a different mechanism would be required to ensure that high reliability transmissions are achieved.
Furthermore, in some related art multiplexing NR-V2X control and data channels (i.e., PSCCH and PSSCH), the sidelink structure includes first a Physical Sidelink Control Channel (PSCCH) for signaling sidelink channel information, followed by a Physical Sidelink Shared Channel (PSSCH) for carrying data TBs within a fixed subchannel block. If the size of the data TB is too large and multiple sub-channels need to be used for carrying, other sub-channels may be used by time slot aggregation in the time domain. Although the amount of side-link resources used to transmit PSCCH and PSSCH in the frequency domain is the same, the additional sub-channels appended at the end are not ideal for side-link transmissions requiring low delay delivery.
Accordingly, the present disclosure provides an end-to-end data transmission method and apparatus.
It should be appreciated that the technical solutions of the present disclosure may be used in various wireless communication systems, such as global system for mobile communications (GSM), general Packet Radio Service (GPRS), wideband Code Division Multiple Access (WCDMA), high Speed Packet Access (HSPA), LTE-advanced (LTE-a), new Radio (NR), etc. Furthermore, communication between the terminal and network devices in the wireless communication network may be performed according to any suitable generation communication protocol, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols and/or any other protocols currently known or developed in the future.
It should be understood that the term "terminal" refers to any terminal device that can access a wireless communication network and receive services therefrom. A terminal may include a User Equipment (UE), also referred to as a mobile terminal or mobile user equipment, or the like. The user equipment may be a mobile terminal such as a mobile phone (also referred to as a cellular phone) or a computer with a mobile terminal such as a portable, pocket, hand-held, car-mounted mobile device or a built-in computer.
It should be understood that the term "network device" refers to a device in a wireless communication network through which a terminal accesses the network and receives services therefrom. The network device may include a Base Station (BS), an Access Point (AP), a Mobility Management Entity (MME), a multi-cell/Multicast Coordination Entity (MCE), an access and mobility management function (AMF)/User Plane Function (UPF), a gateway, a server, a controller, or any other suitable device in a wireless communication network. The BS may be a Base Transceiver Station (BTS) in GSM or CDMA, for example, or may be a node B in WCDMA, or may be an evolved node B (eNB or e-NodeB) in LTE or LTE-a, or may be a gNB in NR, and the disclosure is not limited thereto. However, for convenience of description, reference is made to the eNB as an example in the following embodiments.
Fig. 1 schematically illustrates an end-to-end data transmission system architecture according to an embodiment of the present disclosure.
Referring to fig. 1, an end-to-end data transmission system 10 includes: a network device 11, a first terminal 12 (here a transmitting terminal) and a second terminal 13 (here a receiving terminal).
The communication between the network device 11 and the first terminal 12 and the communication between the network device 11 and the second terminal 13 is realized over an air interface of a first type, e.g. the Uu interface in cellular mobile communication. And, communication between the first terminal 12 and the second terminal 13 is effected over a second type of air interface (e.g., a side-link air interface).
The network device 11 may schedule side uplink resources for transmission by the first terminal 12. For example, a specific Downlink Control Information (DCI) format is used to transmit side-link resources for PSCCH and PSSCH on a PDCCH (physical downlink control channel) to the first terminal 12. Alternatively, the side-uplink resource pool for transmission by the first terminal 12 may be configured by the network device 11. For example, the network device 11 statically or semi-statically configures a side-uplink resource pool for side-uplink transmissions. The first terminal 12 determines PSSCH resources and PSCCH resources from the resources of the PSSCH and PSCCH in the side-link resource pool. After the first terminal 12 receives or determines the PSSCH resources and PSCCH resources, the PSSCH resources and other transmission parameters on the PSCCH are transmitted on the PSCCH to the second terminal 13 and its side-link data is transmitted on the PSSCH to the second terminal 13 based on the PSSCH resources.
It will be appreciated that there may be a plurality of first and second terminals in the end-to-end data transmission system 10. In fig. 1, only the first terminal 12 and the second terminal 13 are exemplarily shown for the sake of simplifying the drawing. However, this does not mean that the number of the first terminals 12 and the second terminals 13 is limited.
It should be noted that the side uplink data may include user data of the user plane and may also include signaling or messages of the control plane.
As described above, if the data TB size is too large to be carried in one subchannel block, additional subchannels may be used by slot aggregation in the time domain. However, the extra sub-channels appended at the end are not ideal for side-link transmissions requiring low delay delivery.
In the present disclosure, a variable number of subchannels in the frequency domain are configured to accommodate varying data TB sizes. However, if only one subchannel block is used for transmitting the PSCCH and a plurality of subchannels are used for transmitting the PSCCH, there is a mismatch in the amount of side-link resources used in the frequency domain to transmit the PSCCH and the PSCCH corresponding to the PSCCH. The power required to transmit the PSCCH will be much less than the power required to transmit the PSSCH. Thus, the first terminal 12 will need to use additional Orthogonal Frequency Division Multiplexing (OFDM) symbols between the PSCCH and PSSCH for Automatic Gain Control (AGC) training at the second terminal 13 to address the power mismatch. That is, the side-link resource utilization will be low because additional OFDM symbols must be used for AGC purposes. The present disclosure also provides a structure for side-uplink control channel retransmission when PSSCH is transmitted through a plurality of side-uplink sub-channels in the frequency domain, to solve the above-mentioned problems.
Fig. 2 schematically illustrates a structure for side-uplink control channel retransmission on multiple side-uplink sub-channels.
As shown in fig. 2, an exemplary structure (100) of side-uplink control channel retransmissions over multiple side-uplink sub-channels is provided. In the structure (100), a plurality of side-link subchannels (103) are used for transmitting the PSSCH (102). For each side-uplink sub-channel (103), its associated PSCCH (101) is also transmitted. Since multiple side-link sub-channels (103) are used to carry one PSSCH (102), the same PSCCH (101) is retransmitted (104) and transmitted in all side-link sub-channels (103).
Note that the side-link sub-channel may occupy one or more slots in the time domain, or may occupy one or more OFDM symbols, although the disclosure is not limited to the examples described herein.
The first terminal 12 encodes side-link control information (SCI) according to the side-link subchannel size. For example, SCI is encoded based on one side-downlink subchannel size. In addition, the first terminal 12 may also encode the SCI based on the sizes of the plurality of side-uplink sub-channels. And the number of side-downlink subchannels used for SCI coding should be less than the number of side-downlink subchannels used for carrying the PSSCH. The coded SCI is then modulated and mapped to a physical side-uplink control channel (PSCCH). When the PSCCH is transmitted using multiple frequency domain side uplink sub-channels, the PSCCH is retransmitted and transmitted in the same multiple side uplink sub-channels that are used to carry the PSCCH corresponding to the PSCCH.
Regarding the second terminal 13, since it does not know the number of side link sub-channels used by the first terminal 12 for PSCCH retransmission, the second terminal 13 listens to the configured PSCCHs, receives SCIs from the PSCCHs in the received plurality of side link sub-channels, and performs demodulation of each PSCCH and attempts to decode the SCIs individually in units of side link sub-channels, or incrementally merges PSCCHs across side link sub-channels before attempting to decode the SCIs.
In embodiments of the present disclosure, the subchannels are contiguous in the frequency domain. Accordingly, the PSCCH is retransmitted and transmitted in the same plurality of consecutive side-link subchannels used to carry the PSCCH corresponding to the PSCCH.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive synchronization signals transmitted from each other. Alternatively, the first terminal 12 and the second terminal 13 may transmit the synchronization signal to each other in a broadcast manner, so that other second terminals 13 communicating with the first terminal 12 through the side links may receive the synchronization signal transmitted by the first terminal.
The synchronization signal may include clock information (transmission clock) and Identity (ID) information, among others. Accordingly, the first terminal 12 and the second terminal 13 can obtain clock information and ID information of each other upon receiving synchronization signals transmitted to each other, and then the first terminal 12 and the second terminal 13 can complete synchronization. The synchronization process may refer to synchronization descriptions in the prior art, and will not be described in detail in the embodiments of the present disclosure.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive broadcast channels transmitted from each other. The first terminal 12 and the second terminal 13 may receive each other's broadcast channel to determine each other's transmission bandwidth and determine whether they are within the coverage of the network device 11.
In embodiments of the present disclosure, the network device 11 may receive a resource request for side-link data transmission sent by the first terminal 12 before transmitting a specific DCI to the first terminal 12 to transmit PSSCH resources. The resource request for the side-link data transmission may be a Scheduling Request (SR) or a Buffer Status Report (BSR).
In embodiments of the present disclosure, the network device 11 may also receive side uplink Channel State Information (CSI) from the first terminal 12 to feed back channel quality information in the side uplink before transmitting the specific DCI to the first terminal 12 to transmit the PSSCH resources.
In embodiments of the present disclosure, the SCI format may include a frequency domain resource allocation field and a time domain resource allocation field. The frequency domain resource allocation field and the time domain resource allocation field are configured to indicate frequency resources and time resources, respectively, in the sidelink allocated to the first terminal 12 for sidelink transmission.
In an alternative embodiment of the present disclosure, the SCI format may include a subchannel block allocation field to indicate time-frequency domain resources in the side uplink. The NR subchannel allocation field is configured to indicate a subchannel block in the sidelink for sidelink transmission or reception. A subchannel block may be defined as a preset number of consecutive OFDM symbols in the time domain and a preset number of consecutive subcarriers in the frequency domain.
Note that the frequency domain resources for the side-link transmission and reception may be determined by the active bandwidth portion (active bandwidth part) of the first terminal 12 for the side-link transmission and the active bandwidth portion of the second terminal 13 for the side-link reception. Similarly, the time domain resources used for side-uplink transmission and reception may be based on the time domain resource set/table configured to the first terminal 12 and the time domain resource set/table configured to the second terminal 13.
The SCI may further include a modulation and coding scheme field. The field is configured to indicate a modulation and coding scheme of the sidelink data transmitted in the sidelink. The first terminal 12 encodes and modulates side-uplink data to be transmitted by using a modulation and coding scheme, and the second terminal 13 demodulates and decodes the received side-uplink data using the modulation and coding scheme.
Fig. 3 schematically illustrates a flow chart of an end-to-end data transmission method according to an embodiment of the present disclosure. The method may be applied to, for example, the end-to-end data transmission system 10 of fig. 1.
Referring to fig. 3, the method 20 includes:
in step S202, the network device 11 transmits DCI on the PDCCH to the first terminal 12 to schedule side-uplink resources for the PSCCH and the PSSCH.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive synchronization signals transmitted from each other before step S202. Alternatively, the first terminal 12 and the second terminal 13 may transmit the synchronization signal to each other by broadcasting so that other second terminals 13 communicating with the first terminal 12 through the side links may receive the synchronization signal transmitted by the first terminal.
The synchronization signal may include clock information (transmission clock) and Identity (ID) information, among others. Accordingly, the first terminal 12 and the second terminal 13 can obtain clock information and ID information of each other upon receiving synchronization signals transmitted to each other, and then the first terminal 12 and the second terminal 13 can complete synchronization. The synchronization process may refer to synchronization descriptions in the prior art, and will not be described in detail in the embodiments of the present disclosure.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive broadcast channels transmitted from each other before step S202. The first terminal 12 and the second terminal 13 may receive each other's broadcast channel to determine each other's transmission bandwidth and determine whether they are within the coverage of the network device 11.
In an embodiment of the present disclosure, before transmitting a specific DCI to the first terminal 12 to transmit PSSCH resources, the network device 11 may receive a resource request for side-uplink data transmission sent by the first terminal 12, before step S202. The resource request for the side-link data transmission may be a Scheduling Request (SR) or a Buffer Status Report (BSR).
In an embodiment of the present disclosure, the network device 11 may also receive side-link Channel State Information (CSI) from the first terminal 12 to feedback channel quality information in the side-link before transmitting the specific DCI to the first terminal 12 to transmit the PSSCH resource before step S202.
The first terminal 12 listens to the DCI and receives side-link resources for the PSCCH and PSSCH, including information for the sub-channels of the PSCCH transmission.
The variable number of sub-channels in the frequency domain for the PSSCH is configured to accommodate varying data TB sizes. In embodiments of the present disclosure, the subchannels are contiguous in the frequency domain.
In step S204, the first terminal 12 encodes the SCI according to the side-uplink subchannel size, modulates the encoded SCI, and then maps the modulated SCI onto the PSCCH. When multiple frequency domain side-link sub-channels are used for transmitting the PSCCHs, the first terminal 12 repeatedly transmits the PSCCHs in the same multiple side-link sub-channels used to carry the PSCCHs corresponding to the PSCCHs.
In embodiments of the present disclosure, the SCI format may include a frequency domain resource allocation field and a time domain resource allocation field. The frequency domain resource allocation field and the time domain resource allocation field are configured to indicate frequency resources and time resources, respectively, in the sidelink allocated to the first terminal 12 for sidelink transmission.
In an alternative embodiment of the present disclosure, the SCI format may include a subchannel block allocation field to indicate time-frequency domain resources in the side uplink. The NR subchannel allocation field is configured to indicate a subchannel block in the sidelink for sidelink transmission or reception. A subchannel block may be defined as a preset number of consecutive OFDM symbols in the time domain and a preset number of consecutive subcarriers in the frequency domain.
Note that the frequency domain resources for the side-link transmission and reception may be determined by the active bandwidth portion of the first terminal 12 for the side-link transmission and the active bandwidth portion of the second terminal 13 for the side-link reception. Similarly, the time domain resources used for side-uplink transmission and reception may be based on the time domain resource set/table configured to the first terminal 12 and the time domain resource set/table configured to the second terminal 13.
The SCI may further include a modulation and coding scheme field. The field is configured to indicate a modulation and coding scheme of the sidelink data transmitted in the sidelink. The first terminal 12 encodes and modulates side-uplink data to be transmitted by using a modulation and coding scheme, and the second terminal 13 demodulates and decodes the received side-uplink data using the modulation and coding scheme.
In step S206, the second terminal 13 listens to the configured PSCCH, receives its PSCCH in a plurality of side-link sub-channels, and decodes the SCI from the received PSCCH.
In an embodiment of the present disclosure, the second terminal 13 demodulates each PSCCH in units of side-link subchannels and attempts to decode the SCI individually.
In an embodiment of the present disclosure, the second terminal 13 incrementally merges the PSCCHs across the side-link sub-channels and attempts to decode the merged SCI.
The end-to-end data transmission method according to the embodiments of the present disclosure aims to solve the aforementioned problem of transmission power mismatch between PSCCH transmission and PSSCH transmission, while allowing low-delay transmission of messages of large data TB size. Other benefits of using the above-described transmission structure include: the reliability of PSCCH reception is improved by combining the retransmitted control channel transmissions at the receiving end; no additional receiver complexity in decoding the control channel information; and allows the UE to flexibly implement control channel reception and decoding of the PSCCH, since combining the PSCCH is performed at the full discretion of the receiving terminal prior to decoding.
Fig. 4 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure. The method may also be applied to, for example, the end-to-end data transmission system 10 of fig. 1.
Referring to fig. 4, the method 30 includes:
in step S302, the network device 11 configures the first terminal 12 with a side-uplink resource pool statically or semi-statically.
The network device 11 may configure the first terminal 12 with a side-uplink resource pool through an RRC (radio resource control) message.
The first terminal 12 receives and stores a pool of side-link resources for side-link transmissions.
In step S304, the first terminal 12 determines PSSCH resources and PSCCH resources for side-link transmission to the second terminal 13 from the resources of the PSSCH and PSCCH in the side-link resource pool.
The first terminal 12 may learn which of the sidelink resources (including PSSCH resources and PSCCH resources) in the sidelink resource pool are unoccupied, for example, by listening to other sidelink transmissions.
The variable number of sub-channels for the PSSCH in the frequency domain is configured to accommodate the varying data TB size. In embodiments of the present disclosure, the subchannels are contiguous in the frequency domain.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive synchronization signals transmitted from each other before step S304. Alternatively, the first terminal 12 and the second terminal 13 may transmit the synchronization signal to each other by broadcasting so that other second terminals 13 communicating with the first terminal 12 through the side links may receive the synchronization signal transmitted by the first terminal.
The synchronization signal may include clock information (transmission clock) and Identity (ID) information, among others. Accordingly, the first terminal 12 and the second terminal 13 can obtain clock information and ID information of each other upon receiving synchronization signals transmitted to each other, and then the first terminal 12 and the second terminal 13 can complete synchronization. The synchronization process may refer to synchronization descriptions in the prior art, and will not be described in detail in the embodiments of the present disclosure.
In an embodiment of the present disclosure, the first terminal 12 and the second terminal 13 may receive broadcast channels transmitted from each other before step S304. The first terminal 12 and the second terminal 13 may receive each other's broadcast channel to determine each other's transmission bandwidth and determine whether they are within the coverage of the network device 11.
In step S306, the first terminal 12 encodes the SCI according to the side-uplink subchannel size, modulates the encoded SCI, and then maps the modulated SCI onto the PSCCH. When multiple frequency domain side-link sub-channels are used for transmitting the PSCCHs, the first terminal 12 repeatedly transmits the PSCCHs in the same multiple side-link sub-channels used to carry the PSCCHs corresponding to the PSCCHs.
In embodiments of the present disclosure, the SCI format may include a frequency domain resource allocation field and a time domain resource allocation field. The fields of the frequency domain resource allocation and the time domain resource allocation are configured to indicate frequency resources and time resources, respectively, in the sidelink allocated to the first terminal 12 for sidelink transmission.
In an alternative embodiment of the present disclosure, the SCI format may include a subchannel block allocation field to indicate time-frequency domain resources in the side uplink. The NR subchannel allocation field is configured to indicate a subchannel block in the sidelink for sidelink transmission or reception. A subchannel block may be defined as a preset number of consecutive OFDM symbols in the time domain and a preset number of consecutive subcarriers in the frequency domain.
The SCI may further include a modulation and coding scheme field. The field is configured to indicate a modulation and coding scheme of the sidelink data transmitted in the sidelink. The first terminal 12 encodes and modulates side-uplink data to be transmitted by using a modulation and coding scheme, and the second terminal 13 demodulates and decodes the received side-uplink data using the modulation and coding scheme.
In step S308, the second terminal 13 listens to the configured PSCCH, receives its PSCCH in a plurality of side-link sub-channels, and decodes the SCI from the received PSCCH.
In an embodiment of the present disclosure, the second terminal 13 demodulates each PSCCH in units of side-link subchannels and attempts to decode the SCI individually.
In an embodiment of the present disclosure, the second terminal 13 incrementally merges the PSCCHs across the side-link sub-channels and attempts to decode the merged SCI.
The end-to-end data transmission method according to the embodiments of the present disclosure aims to solve the aforementioned problem of transmission power mismatch between PSCCH and PSSCH transmissions, while allowing low-latency transmission of large data TB size messages. Other benefits of using the above-described transmission structure include: the reliability of PSCCH reception is improved by combining the retransmitted control channel transmissions at the receiving end; no additional receiver complexity in decoding the control channel information; and allows the UE to flexibly implement control channel reception and decoding of the PSCCH, since combining the PSCCH is performed at the full discretion of the receiving terminal prior to decoding.
Fig. 5 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure. The method may be applied to the first terminal 12 in fig. 1, for example.
Referring to fig. 5, the method 40 includes:
in step S402, the first terminal 12 encodes the SCI according to the side-uplink subchannel size and modulates the encoded SCI.
After the first terminal 12 receives or determines the PSSCH resources and PSCCH resources, it encodes the SCI according to the side-link subchannel size and modulates the encoded SCI.
Note that the side-link sub-channel may occupy one or more slots in the time domain, or may occupy one or more OFDM symbols, although the disclosure is not limited to the examples described herein.
In step S404, the first terminal 12 maps the modulated SCI onto the PSCCH.
In embodiments of the present disclosure, the SCI format may include a frequency domain resource allocation field and a time domain resource allocation field. The fields of the frequency domain resource allocation and the time domain resource allocation are configured to indicate frequency resources and time resources, respectively, in the sidelink allocated to the first terminal 12 for sidelink transmission.
In an alternative embodiment of the present disclosure, the SCI format may include a subchannel block allocation field to indicate time-frequency domain resources in the side uplink. The NR subchannel allocation field is configured to indicate a subchannel block in the sidelink for sidelink transmission or reception. A subchannel block may be defined as a preset number of consecutive OFDM symbols in the time domain and a preset number of consecutive subcarriers in the frequency domain.
The SCI may further include a modulation and coding scheme field. The field is configured to indicate a modulation and coding scheme of the sidelink data transmitted in the sidelink. The first terminal 12 encodes and modulates side uplink data to be transmitted by using a modulation and coding scheme, and the second terminal 13 demodulates and decodes the received side uplink data using the modulation and coding scheme.
In step S406, when a plurality of frequency domain side-link subchannels are used for transmitting the PSCCH, the first terminal 12 repeatedly transmits the PSCCH in the same plurality of side-link subchannels used to carry the PSCCH corresponding to the PSCCH.
The first terminal 12 then also transmits side-link data to the second terminal 13 in a plurality of side-link sub-channels.
The end-to-end data transmission method according to the embodiments of the present disclosure aims to solve the aforementioned problem of transmission power mismatch between PSCCH transmission and PSSCH transmission, while allowing low-delay transmission of messages of large data TB size. Other benefits of using the above-described transmission structure include: the reliability of PSCCH reception is improved by combining the retransmitted control channel transmissions at the receiving end; no additional receiver complexity in decoding the control channel information; and allows the UE to flexibly implement control channel reception and decoding of the PSCCH, since combining the PSCCH is performed at the full discretion of the receiving terminal prior to decoding.
Fig. 6 schematically illustrates a flow chart of a method of end-to-end data transmission according to another embodiment of the present disclosure. The method may be applied, for example, to the second terminal 13 in fig. 1.
Referring to fig. 6, the method 50 includes:
in step S502, the second terminal 13 listens to the configured PSCCH.
Prior to step S502, the second terminal 13 may receive the configured PSCCH from the network device 11 for side-link reception, e.g. by means of an RRC message.
In step S504, the second terminal 13 receives its PSCCH in a plurality of side-link sub-channels and decodes the SCI from the received PSCCH.
In an embodiment of the present disclosure, the second terminal 13 demodulates each PSCCH in units of side-link subchannels and attempts to decode the SCI individually.
In an embodiment of the present disclosure, the second terminal 13 incrementally merges the PSCCHs across the side-link sub-channels and attempts to decode the merged SCI.
After decoding the SCI, the second terminal 13 receives and decodes side uplink data from the side link sub-channel on the PSSCH indicated by the SCI.
The end-to-end data transmission method according to the embodiments of the present disclosure aims to solve the aforementioned problem of transmission power mismatch between PSCCH transmission and PSSCH transmission, while allowing low-delay transmission of messages of large data TB size. Other benefits of using the above-described transmission structure include: the reliability of PSCCH reception is improved by combining the retransmitted control channel transmissions at the receiving end; no additional receiver complexity in decoding the control channel information; and allows the UE to flexibly implement control channel reception and decoding of the PSCCH, since combining the PSCCH is performed at the full discretion of the receiving terminal prior to decoding.
The following are embodiments of the apparatus of the present disclosure that may be used to perform method embodiments of the present disclosure. For details not disclosed in the embodiments of the apparatus of the present disclosure, please refer to the embodiments of the method of the present disclosure.
Fig. 7 schematically illustrates a terminal according to an embodiment of the present disclosure. The terminal may be the first terminal 12 in fig. 1.
Referring to fig. 7, the terminal 60 includes: coding unit 602, modulation unit 604, mapping unit 606 and transmission unit 608.
The encoding unit 602 is configured to encode the SCI according to the side-uplink subchannel size.
The modulation unit 604 is configured to modulate the coded SCI.
The mapping unit 606 is configured to map the modulated SCI onto the PSCCH.
The transmission unit 608 is configured to repeatedly transmit the PSCCH in a plurality of side-uplink sub-channels that carry the PSSCH corresponding to the PSCCH when the plurality of frequency-domain side-uplink sub-channels are used to transmit the PSSCH.
In an embodiment of the present disclosure, the plurality of side-link sub-channels are contiguous in the frequency domain.
It is important to note that in the disclosed embodiment, the encoding unit 602, the modulation unit 604, and the mapping unit 606 may be implemented by a processor (e.g., the processor 1102 in fig. 11), and the transmission unit 608 may be implemented by a transmitter (e.g., the transmitter 1106 in fig. 11).
Fig. 11 schematically illustrates a terminal device according to an embodiment of the present disclosure.
As shown in fig. 11, terminal device 110 may include a processor 1102, a receiver 1104, a transmitter 1106, and a memory 1108, where memory 1108 may be configured to store code executed by processor 1102 and the like.
Each of the components in terminal device 110 are coupled together by a bus system 1110, where bus system 1010 includes a data bus, and also includes a power bus, a control bus, and a status signal bus.
The terminal 60 shown in fig. 7 and the terminal device 110 shown in fig. 11 may implement each process implemented by the first terminal 12 in the above-described method embodiment, and are not repeated here.
The processor 1102 generally controls overall operation of the terminal device 110, such as operations related to display, data communication, and recording operations. The processor 1102 may include one or more processors to execute code in the memory 1108. Optionally, when executing the code, the processor 1102 implements a method executed by the first terminal device 12 in the method embodiment, which is not described herein for brevity. Further, the processor 1102 may include one or more modules that facilitate interactions between the processor 1102 and other components.
Memory 1108 is configured to store various types of data to support the operation of terminal device 110. Examples of such data include instructions for any application or method operating on terminal device 110, contact data, phonebook data, messages, pictures, video, and the like. The memory 1008 may be implemented using any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), memory, and the like. Erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, or magnetic or optical disk.
The receiver 1104 is configured to receive electromagnetic signals received by the antenna. The main function of the receiver is to select the desired frequency components from among the numerous electromagnetic waves present in the air, suppress or filter unwanted signals or noise and interference signals, and then obtain the original useful information after amplification and demodulation.
The transmitter 1106 is configured to generate and modulate RF current and transmit radio waves through an antenna.
In embodiments of the present disclosure, the transmitter 1106 and the receiver 1104 may be implemented as transceivers.
Fig. 8 schematically illustrates a terminal according to another embodiment of the present disclosure. The terminal may be the first terminal 12 in fig. 1.
Referring to fig. 8, the terminal 70 includes: coding unit 702, modulation unit 704, mapping unit 706, transmission unit 708 and reception unit 710.
The encoding unit 702 is configured to encode the SCI according to the side-downlink subchannel size.
The modulation unit 704 is configured to modulate the coded SCI.
Mapping unit 706 is configured to map the modulated SCI onto the PSCCH.
The transmitting unit 708 is configured to repeatedly transmit the PSCCH in a same plurality of side-link sub-channels used to carry the PSSCH corresponding to the PSCCH when the plurality of frequency domain side-link sub-channels are used to transmit the PSSCH.
The receiving unit 710 is configured to receive information of a side link sub-channel.
In embodiments of the present disclosure, the side-downlink subchannels are contiguous in the frequency domain.
It is important to note that in embodiments of the present disclosure, the encoding unit 702, the modulation unit 704, and the mapping unit 706 may be implemented by a processor (e.g., the processor 1102 in fig. 11), the transmission unit 708 may be implemented by a transmitter (e.g., the transmitter 1106 in fig. 11), and the receiving unit 710 may be implemented by a receiver (e.g., the receiver 1104 in fig. 11).
The terminal 70 shown in fig. 8 and the terminal device 110 shown in fig. 11 may implement each process implemented by the first terminal 12 in the above-described method embodiment, and are not repeated herein.
Fig. 9 schematically illustrates a terminal according to another embodiment of the present disclosure. The terminal may be the first terminal 12 in fig. 1.
Referring to fig. 9, the terminal 80 includes: coding unit 802, modulation unit 804, mapping unit 806, transmission unit 808, reception unit 810, and determination unit 812.
The encoding unit 802 is configured to encode the SCI according to the side-uplink subchannel size.
The modulation unit 804 is configured to modulate the encoded SCI.
The mapping unit 806 is configured to map the modulated SCI onto the PSCCH.
The transmitting unit 808 is configured to repeatedly transmit the PSCCH in a same plurality of side-link sub-channels used to carry the PSSCH corresponding to the PSCCH when the plurality of frequency domain side-link sub-channels are used to transmit the PSSCH.
The receiving unit 810 is configured to receive a side-link resource pool for side-link transmission.
The determining unit 812 is configured to determine a plurality of side-link sub-channels based on the resources of the PSSCH and PSCCH in the side-link resource pool.
In embodiments of the present disclosure, the side-downlink subchannels are contiguous in the frequency domain.
It is important to note that in the disclosed embodiment, the encoding unit 802, the modulation unit 804, the mapping unit 806, and the determination unit 810 may be implemented by a processor (e.g., the processor 1102 in fig. 11). Further, the transmission unit 808 may be implemented by a transmitter (e.g., the transmitter 1106 in fig. 11), and the reception unit 812 may be implemented by a receiver (e.g., the receiver 1104 in fig. 11).
The terminal 80 shown in fig. 9 and the terminal device 110 shown in fig. 11 may implement each process implemented by the first terminal 12 in the above-described method embodiment, and are not repeated here to avoid repetition.
Fig. 10 schematically illustrates a terminal according to another embodiment of the present disclosure. The terminal may be the second terminal 13 in fig. 2.
Referring to fig. 10, the terminal 90 includes: the receiving unit 902 and the decoding unit 904.
The receiving unit 902 is configured to listen to the configured PSCCH and receive its PSCCH in a plurality of side-uplink sub-channels.
The decoding unit 904 is configured to decode SCI from the received PSCCH.
In an embodiment of the present disclosure, the decoding unit 904 is further configured to demodulate each PSCCH in units of side-link subchannels and decode the SCIs separately.
In an embodiment of the present disclosure, the decoding unit 904 is further configured to incrementally combine the received PSCCHs across the side-link sub-channels and decode the combined SCIs.
It is important to note that in embodiments of the present disclosure, the receiving unit 902 may be implemented by a receiver (e.g., receiver 1204 in fig. 12), and the decoding unit 904 may be implemented by a processor (e.g., processor 1202 in fig. 12).
Fig. 12 schematically illustrates a terminal device according to another embodiment of the present disclosure.
As shown in fig. 12, the terminal device 120 may include a processor 1202, a receiver 1204, a transmitter 1206, and a memory 1208, wherein the memory 1208 may be configured to store code for execution by the processor 1202 and the like.
Each of the components in the terminal device 120 are coupled together by a bus system 1210, wherein the bus system 1210 includes a data bus, and further includes a power bus, a control bus, and a status signal bus.
The processor 1202 generally controls overall operation of the terminal device 120, such as operations related to display, data communication, and recording operations. The processor 1202 may include one or more processors to execute code in the memory 1208. Optionally, when executing the code, the processor 1202 implements a method executed by the second terminal device 13 in the method embodiment, which is not described herein for brevity. Further, the processor 1202 may include one or more modules that facilitate interactions between the processor 1202 and other components.
The memory 1208 is configured to store various types of data to support operation of the terminal device 120. Examples of such data include instructions for any application or method operating on terminal device 120, contact data, phonebook data, messages, pictures, video, and the like. The memory 1008 may be implemented using any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), memory, and the like. Erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, or magnetic or optical disk.
The receiver 1204 is configured to receive electromagnetic signals received by the antenna. The main function of the receiver is to select the desired frequency components from among the numerous electromagnetic waves present in the air, suppress or filter unwanted signals or noise and interference signals, and then obtain the original useful information after amplification and demodulation.
The transmitter 1206 is configured to generate and modulate RF current and transmit radio waves through an antenna.
In embodiments of the present disclosure, the transmitter 1206 and the receiver 1204 may be implemented as transceivers.
Each process implemented by the second terminal 13 in the above-described method embodiment may be implemented by the terminal 90 shown in fig. 10 and the terminal device 120 shown in fig. 12, which are not repeated here.
The exemplary embodiments have been particularly shown and described above. Those skilled in the art will appreciate that the present disclosure is not limited to the disclosed embodiments; rather, all suitable modifications and equivalents that fall within the spirit and scope of the claims appended hereto are intended to be included within the scope of the disclosure.
Claims (10)
1. An end-to-end data transmission method, comprising:
the first terminal encodes side link control information SCI according to the side link sub-channel size;
the first terminal modulates the coded SCI;
the first terminal maps the modulated SCI to a physical side uplink control channel PSCCH; and
when a frequency domain side link sub-channel is used to transmit a physical side link shared channel, PSSCH, the first terminal repeatedly transmits the PSCCH in the same side link sub-channel used to carry the PSSCH corresponding to the PSCCH.
2. The method of claim 1, wherein the side link sub-channel is contiguous in the frequency domain.
3. The method of claim 1, further comprising:
the first terminal receives information of the side link sub-channel.
4. The method of claim 1, further comprising:
the first terminal receives a side-uplink resource pool for side-uplink transmission; and
the first terminal determines the side link sub-channel from the resources of the PSSCH and the PSCCH in the side link resource pool.
5. A terminal, comprising: coding unit, modulation unit, mapping unit and transmission unit,
wherein the encoding unit is configured to encode the SCI according to a side-uplink subchannel size;
the modulation unit is configured to modulate the encoded SCI;
the mapping unit is configured to map the modulated SCI onto the PSCCH;
the transmission unit is configured to repeatedly transmit the PSCCH in a same side-link subchannel used to carry a PSCCH corresponding to the PSCCH when a frequency domain side-link subchannel is used to transmit the PSCCH.
6. The terminal of claim 5, wherein the side link sub-channel is contiguous in the frequency domain.
7. The terminal of claim 5, further comprising: the receiving unit is configured to receive the received signal,
Wherein the receiving unit is configured to receive information of the side link sub-channel.
8. The terminal of claim 5, further comprising: a determining unit and a receiving unit,
wherein the receiving unit is configured to receive a side-uplink resource pool for side-uplink transmissions;
the determining unit is configured to determine the side-link sub-channel from resources of the PSSCH and the PSCCH in the side-link resource pool.
9. A terminal device, comprising:
a processor;
a memory configured to store instructions executable by the processor,
wherein the processor is configured to perform the steps of the method according to any of claims 1-4.
10. A computer readable storage medium having instructions stored thereon, which when executed by a processor perform the steps of the method according to any of claims 1-4.
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| US62/754,174 | 2018-11-01 | ||
| PCT/CN2019/114825 WO2020088609A1 (en) | 2018-11-01 | 2019-10-31 | End-to-end data transmission method and device |
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| KR20210020460A (en) * | 2019-08-14 | 2021-02-24 | 삼성전자주식회사 | Method and apparatus for harq feedback in a wireless communication system |
| WO2022222079A1 (en) * | 2021-04-21 | 2022-10-27 | Oppo广东移动通信有限公司 | Resource configuration method and device, and storage medium |
| US11889517B2 (en) * | 2021-05-05 | 2024-01-30 | Qualcomm Incorporated | Configured chase-combining reception for new radio (NR) sidelink mode 1 |
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| CN108632781B (en) * | 2017-03-24 | 2023-10-31 | 北京三星通信技术研究有限公司 | Resource selection or reselection method in vehicle-to-outside communication and user equipment |
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| CN106489246A (en) * | 2014-08-01 | 2017-03-08 | 英特尔Ip公司 | PDCCH design for arrowband deployment |
| WO2017135998A1 (en) * | 2016-02-04 | 2017-08-10 | Intel IP Corporation | Sensing-based collision avoidance for v2v communication |
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